JvJCLUtils
  add function EmptyRect: TRect;
  
JvJVCLUtils
  added:
  function RectClientToScreen; // not equal to TControl.ClientToParent
  function RectScreenToClient;
  function MapControlRect;
  function MapControlPoint;
  function GetControlRect;
  function GetControlScreenRect;// not equal to TControl.ClientRect

  function GetTopOwner;
  function GetTopForm;
